Advertising sign



FIG. 1 is a perspective view of a advertising sign in accordance with our new design;

FIG. 2 is a top plan view thereof, the bottom plan view being a mirror image thereof;

FIG. 3 is a front elevational view thereof; and,

FIG. 4 is a right side elevational view thereof the left side elevational view being a mirror image thereof.

The broken line showing further details of the advertising sign are for illustrative purposes only and form no part of the claimed design. 

An ornamental design for a advertising sign, as shown and described. 